I recently bought a boat, it came with a humminbird 998c SI at the console. I tried it out and wasn't impressed. I have a lowrance hds 9 touch to swap it out with. I'm looking into getting a hds 7 touch for up front on the boat. But I can't find any humminbird used for sale. Can anyone help with a value? I'd hope I'd have enough to buy a hds 7 gen 2 touch so I can network them.